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低温空管冷冻浓缩技术-GC-MS-FID法自动监测环境空气中VOCs
On-Line Monitoring of VOCs in Ambient Air Based on Cryo-Trapping-GC-MS-FID
投稿时间:2017-02-08  修订日期:2017-07-31
DOI:10.19316/j.issn.1002-6002.2017.06.14
中文关键词:  挥发性有机物  分析方法  低温捕集  采样条件  影响
英文关键词:VOCs  analysis method  cryo-trapping  sampling conditions  effect
基金项目:科技部国家重大科学仪器设备开发专项(2012YQ060027)
作者单位
李虹杰 武汉市天虹仪表有限责任公司, 湖北 武汉 430223 
肖庆 武汉市天虹仪表有限责任公司, 湖北 武汉 430223 
韩长绵 武汉市天虹仪表有限责任公司, 湖北 武汉 430223 
刘琳 武汉市天虹仪表有限责任公司, 湖北 武汉 430223 
范新峰 武汉市天虹仪表有限责任公司, 湖北 武汉 430223 
陈楠 湖北省环境监测中心站, 湖北 武汉 430072 
潘怡沛 武汉市天虹仪表有限责任公司, 湖北 武汉 430223 
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中文摘要:
      环境空气中VOCs的自动监测数据是研究重污染天气成因的一个重要依据。低温空管冷冻浓缩技术-GC-MS-FID法,可用于环境空气中多组分VOCs复杂样品的自动监测,性能优于吸附管浓缩法。低温空管冷冻浓缩技术的采样流量、采样时间、冷冻温度等条件对环境空气中VOCs的测定有很大影响。实验结果表明:高采样流量低采样时间条件下,低沸点卤代烃捕集效率偏低;低采样流量长采样时间,-120℃捕集温度可满足各类VOCs的测试。降低采样流量增加采样时间,沸点较高的各类VOCs的捕集效率比较高。相同捕集温度下,降低采样体积,各类VOCs的响应同步降低,可用于高浓度C5~C12碳氢化合物、卤代烃和醛酮含氧化合物样品的测定。
英文摘要:
      Online monitoring data of VOCs in ambient air is very important for studying the cause of heavy pollution weather. In this article,online monitoring of VOCs based on cryo-trapping-GC-MS-FID method is proposed,which can realize the qualitative and quantitative research of complex compounds. This method is superior to adsorption tube condensation. For cryo-trapping-GC-MS-FID method, the sampling rate, sampling time, freezing temperature and other conditions have great influence on the determination of VOCs in the ambient air. Experimental results show that with high sampling rate and low sampling time, the trapping efficiency of low boiling halogenated hydrocarbons is low. With low sampling rate and long sampling time, capture temperature at -120℃ can meet all kinds of VOCs test. Reducing the sampling rate and prolong sampling time, the trapping efficiency of VOCs with high boiling point becomes relatively high. At the same trapping temperature, reducing the sampling volume, the response for all VOCs decrease accordingly, which can be used for measuring the trapping efficiency of high concentration C5-C12 hydrocarbons, halogenated hydrocarbons, aldehyde and ketone oxygenated compounds.
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